Composition fob lining metal pipes



UNITED rraus 'ATT FFICE.

WILLIAM JOHNSTON AND HUGH FORBES, OF BROOKLYN, NEW YORK.

COMPOSITION FOR LINING METAL PIPES.

To all whom it may concern:

Be it known that we, WILLIAM JOHNSTON and HUGH FORBES, of Brooklyn, east district, in the county of Kings and State of New York, have invented a Mode of Permanently Attaching an Adhesive Lining to Leaden or other Metal Pipes; and we do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings and to the letters of reference marked thereon.

The nature of our invention consists in the lining of lead or other metallic pipes for carrying water by a certain composition of matter called gutta percha and bitumen in the proportions hereinafter described.

The principal object of this lining is to protect water pipes from internal corrosion, and to prevent water which passes through metal pipes from being injurious to health, as it is by being impregnated with carbonate of the metal and deleterious oXids or combinations, as is well known to be the case with water passing through and thus coming in contact with lead and certain other metals.

To enable others skilled in the art to make and use our invention, we will proceed to describe its construction and operation.

7e form the lead or other metal pipe or tube in any of the usual well known ways, and we then make a composition of two thirds or thereabout gutta percha and one third bitumen, melting them together into a Huid, whichrwe pour gradually7 into the pipe, and while it is in a semifluid state we pass through the pipe a short clearing and pressing cylinder by means of a wire attached thereto. This cylinder must be as much smaller than the orifice of the tube or pipe as it is intended to make the thickness of the lining of the above described compound mixture. In twenty-four hours the lining becomes perfectly solid and immovable, harder and more adhesive than gutta percha alone-capable however of being bent notwithstanding its hardness.

The accompanying drawings represent the apparatus used, in which- Figure 1 shows the clearing and pressing cylinder in a longitudinal section. Fig. 2 is a cross section of the pressing and clearing cylinder through ae, of Fig. l. Fig. 3 is a longitudinal section of the greasing apparatus-designed to smooth the lining of the pipe.

The same parts are represented by similar letters in all the figures.

Let letters g, g, represent a longitudinal section of the pipe to be lined with the composition.

Let the letters I?, P, represent the cement composition in the melted state ready to be pressed against the sides of the tube g, Q, by drawing forward wire IV, by the loop in the end. The tube having been previously made straight and fixed in its position, and sufficiently warmed to keep the composition pliable, and the thin wings or flanges, f, being used to keep cylinder O in the center of the pipe, and the smoothing rear end part a, af, Z), b, being made of a conical form with the base of the cone at the end, thus obliterating furrows made by flanges f, f, f, f, and allowing the space e for collecting the surplus cement scraped off by the rear smoothing part, any suitable power is applied to the wire WV, which is drawn forward in the direction of the arrow, and on examining the pipe through which the apparatus has been drawn it will be found lined with a uniformly thick coating of cement. But as it frequently happens that the pressing cylinder of Fig. l leaves the lining somewhat rough, a greasing and polishing apparatus shown in Fig. 3 was regarded necessary. This consists substantially of spool M, covered with a cushioned packing of woolen or other sufficient absorbing material that will receive a charge of lard, or oily matter, for suitably greasing the inner surface of the lining; and a cylinder K of metal suitably warmed to softed the cement and attached by screw to 7c', and by nut, r, to le, and W. If now power be applied to IV and the apparatus pulled forward in the direction of the arrow, cylinder M, will grease the surface of the lining, and cylinder K, will slightly fuse the surface of the lining so as to leave a smooth and. glossy surface equivalent to a fine polish.

In case it be found, as occasionally will happen, that the heat of cylinder K will so soften the lining as to start it away from the tube, then the evil may be remedied by surrounding that part of the pipe that has been finished, and as fast as finished, with cold water, which will at once set the cement that is in contact with the tube and leave the inner face of the lining smooth.

In case it be found after the pipe lining has been finished that it needs polishing, this may be done by Warming up the pipe to soften the cement so that it Will iiow, and placing it in a straight form, set the pipe into a rapid rotating motion on its axis so as to make the cement distribute itself upon the inner periphery by centrifugal action, and then cool it While in motion. The inner surface of the bore Will be made suliiciently smooth for the purposes required.

It is proper to state respecting the heating cylinder K, that it is easily detached from M, by unscrewing the nut, 71;, and removing piece, r; 7c is also unscrewed and c is drawn off from the Wire, heated to the required temperature, and replaced for use. It is prevented by means of the shoulder piece, y; from coming Within one inch of the greasy matter mf. The heated cylinder itself must be at its lower rim 71, h one eighth of an inch less than the circumference of the interior of the tube to be polished, so that the heated metal cannot come in actual contact with the lining, and it `will regularly diminish in size, so that the upper rim g g be one eighth of an inch less than the circumference of the lower rim h 7L', that it may not by any oscillation come in contact With the lining. The heated metal cylinder, K, must be heated separately from the rest of the machine, and When hot will be put on the metal pin 7c, being kept in its place by the nut 1.

We do not claim inserting an india rubber gutta percha, or equivalent pipe previously made into a metallic pipe, nor doWe claim the apparatus by Which it is applied; but

N hat We claim and desire to secure by Letters Patent, is

The composition of matter substantially as set forth for lining metallic or other pipes or surfaces of a similar kind substantially as set forth.

WILLIAM JOHNSTON. HUGH FORBES. Vitnesses:

HORACEv FORBES, J. B. PENDLETON. 

